Mortar and pestle



2,1643 WHHM June 13, 1939. E. L. CHOTT MORTAR AND PESTLE Filed April 21, 1937 2 Sheets-Sheet l jP'Z 21 72501,- Z'Z/wardll. 202 2,

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June 13, 1939 jym I 2 172163569: fa? m iii 77 1 E. L. CHOTT MORTAR AND PESTLE Filed April 21,' 1937 2 Sheets-Sheet 2 Patented June 13, 1939 UNITED STATES PATENT OFFICE 6 Claims.

This invention relates to mortars and pestles and more particularly to devices of this character for prepared dental amalgams and other characteristically similar mixtures.

As is well known, dental amalgams usually comprise a triturated mixture of a characteristic metal alloy and mercury. According to the customary practice and owing to the peculiar nature of the work in which it is used, only a relatively small quantity of the amalgam is prepared at any one time and in its preparation, accuracy in the proportioning of the respective ingredients, and thorough mixing and amalgamation thereof under selective predetermined pressures are essential in order to achieve proper results.

The principal object of the present invention is to provide a mortar and pestle having the advantageous features set forth and described in Patent No. 1,878,263, issued to me on September 20, 1932, and in addition provided with novel means for making certain that the trituration is accomplished at a definite pressure such as 1, 2, 3, 4, or 5 pounds, these limits being the usual ones used. However, other pressures may be used if desired, as will be apparent from the following description, reference being had to the accompanying drawings wherein:

Fig. l is a side view of an embodiment of my invention.

Fig. 2 is a top view of the same. Fig. 3 is a sectional elevation taken along the line 3-3 of Fig. 1.

Fig. 4 is a plan section along the line 44 of Fig. 1.

Fig. 5 is a separate view of the bearing sleeve. Fig. 6 is a view in central section showing the cooperating bearing member.

Fig. '7 is a view of the pestle proper. Fig. 8 is an elevation partly in section of a 40 modified form of my invention.

Fig. 9 is a plan section of the same taken along line 99 of Fig. 8.

Fig. 10 is a separate view of the bearing and indicating member of Fig. 8; and

Fig. 11 is a view of the pestle proper shown in Fig. 8. Referring more particularly to the drawings and especially to Figs. 1 to 7 inclusive, I show a mortar l5 substantially of the type shown and described in my Patent No. 1,878,263, referred 50 to above, and pestle I6, the mortar having a base H, a reduced neck portion l8 forming a shoulder I9 for cooperative attachment of a cover 20, which in turn, is hollowed out to fit on neck portion l8 and has a circular seat 2| adapted to 55 rest on shoulder I9. A pair of bayonet slots 22 are formed in the sides of cover 20 and cooperate with a pair of pins 23 secured in neck I8 of base H in the well-known manner to lock cover 20 to the base Base I1 is provided with a cylindrical bore 24 and a spherical bore 25, which merges with a base portion 26, the spherical bore 25 and the base forming the principal triturating or mixing chamber. The cover is further provided with a cylindrical bore 21 adapted to encompass the reduced neck l8 of base I1, and is provided with a spherical bore 28 in a reduced neck 29 in which is formed a flared bore 30.

A cylindrical rod or tube 3| constituting one of the elements which make up the pestle I6 is provided with a threaded stud screw 32 by which a crusher ball 33 is attached thereto and is further provided with a bore or tubular upper portion 34 which, in turn, terminates in a, spring seat 3401.. A small aperture 35 is formed in a wall of bore 34 and suitably threaded to receive a limit stud screw 36, for a purpose to be .ex-' plained more fully hereinafter. The sleeve member 31 is provided with a bore 38 adapted to receive movably or in which telescopes rod 3| and at one end terminates in a spherical bearing seat 39, the latter being arranged to cooperate with and engage bearing seat 23 formed by the sphericalbore in neck 29 of the cover member 20. A circular aperture 40 is formed in a side wall of sleeve 31 and is for the purpose of permitting the stud screw 36 to be secured in aperture 35 after rod 3| has ben inserted in sleeve 31, such that the rod is permitted to reciprocate in the sleeve by only the amount the stud screw 36 can move Within the limits of aperture 40 and the excess diameter of the aperture over the screw to accommodate the material being treated. A plurality of gauge lines or calibrations 4| are described on the outer surface of sleeve 3'! and may be suitably marked With indicia such as 1, 2, 3, 4, and 5, as shown representing the pressure in pounds exerted by the pestle in the mortar, as will be more fully apparent hereinafter. A cap member 42 is provided for sleeve 31 and consists of a cylindrical portion 43 and an hexagonal portion 44 having its bottom forming an indicator edge 45 normal to the axis coacting with calibrations 4| and a counterbore 46 which in turn is provided with a spring seat 41 having one end of a compression spring 48 located therein, and which extends into bore 34 of rod 3|, the opposite end of the spring hexagonal portion of 44 of cap 12 and serves to lock the same on sleeve 31, by which arrangement it is apparent that indicating edge 45 may be selectively aligned with any of the gauge lines 4| and the pressure exerted by the spring 48 under these circumstances will be that indicated by'the particular line H which is in alignment with edge 45. It will be apparent that spherical bore 28 and its cooperating bearing seat 39 together comprise a substantially universal ora ball and socket connection, by which theiball 33may be actuated to any part of bore 25 and that the pressure during 5 mortar, a pestle, means adapted to maintain said trituration will be that indicated by the particular gauge line setting.

In Figs. Ste 11 I Show a modified form of myinvention wherein substantially'the same results may be achieved as in the form just described in modified form. An open top mortar M is arranged to cooperate'with a pestle 52, a framfe' 53 being employed, which ismounted on a base'5 l having a circular recess 55Iadaptedfto receive the mortar 5L; A. pair of vertical posts or standards 56, threaded at both ends, are secured in threaded. sockets or Vaperturesto base 54 by lock nuts 51 and across frame member, bar or bracket'58 having-vertical end apertures 59 and an intermediate aperture '60 '-'isadjustably secured as by knurled edge nuts 6 to posts 56. A bearing block' or'pivot seat 62 having athreaded stud 63 adapted to pass through aperture fill-is secured to bracket '58 by wingb'olt 64 and has a concaved pivot or bearing seat or socket '6'5.

The mortar 5|rhas a circular bore 66 and a spherical bore6l which'merges with the interior bottom surface 68, 'forming the triturating cham- Vbeiy- Pestle 52 has a' shank 69 by which the icrushing ball '10 is secured thereto; The upper end ,ofthe'pestle 52 has'a-tubular bore II the which telescopes a bearing sleeve -'l5V havin'g a sphericalglobular or convex bearing stud 16 at one endthereof corresponding tothe pin "49 at the top of the cap member 42; so /m the 'strflc; ture shownin-the Figs. 1-6 inclusive, canbe used 7 in the sameman-ne'ras described in connection with Figs. 8-1 1,"inclusiveftlieistud being formed asa bearing 11 adapted tojbear'on seato'r socket '65 of the bearing block or pivctseat fi'l Sleeve 151 has' an internal bore 18 providedF-with and forming a spring seat 19therein. "A compression spring BS is adapted to seton'springsea-ts "12 and '19. Member 15 is provided witha cross bore' '81 tions83 adapted to"register 'selectively V ith' th'e edge 13"also disposed-normal t0"the=ai :isfbiit positione'd, operating'and reading inia' 'reverse' direction or inverseorder to-the lines ll' and th" edge "'45 in the 7 form shown in Figs; -1'-6, inclusive, by i which the pressure exerted by the pestle in the 9 mindby the ap ropriate adju 58 by adjusting'nutsfi l.

mortar may be indicated, the same being "deter-istme'nt orbracket 'While Ivhave illustrated andde'scribed was.

s'ocketat the bottom, a'pestle having a tubular recess, tubular member having a 'sphe'ric'all y shaped member for hearing relationship withsaid ferred form of construction for carrying my in vention into effect, this is capable of variation and modification without departing from the spirit of the invention. I, therefore, do not wish to be limited to the precise details of construction is set forth, but desire to avail myself of such variations and modifications as come within the scope of the appended claims.

Having thus described my invention, What I claim as new and desire to securer by Letters Patent is: a

1. A mortar and pestle as described, including a pestle in operative contact with said mortar, said means including a cover for said mortar having a 5 socket, and-a spherically shaped member for bearing relationship with said socket resiliently connected to said pestle. V

2. A mortar and pestle as described, including a mortar, a pestle, means adapted'to maintain said'pestle in operative contact with said mortar, said means including a cover for saidmo'rtar having a socket, and a spherically shaped member for bearing relationship with 'said socket re siliently connected to-zsaid pestle, and meanst rzs V indicate the pressure of said resilient connection, 4 3. A' mortar and pestle as described iwherein said pestle is adapted to be maintained. in contact under pressure with the'mortar, comprising pivot means :for said pestle, a 'tubular imembe'r forming part of saidrpivot means, atubularrecess in said pestle, a spring retained in said member and recess andadapted to be compressedtherebetween, and means'toselec'tively vary said spring compression, "said last meansincluding aivariably "3 5 positioned contact between said tubular member V and said mortar and means to register said pressure.

, 4.'A device of the character described com prising a mortar having a cover with a spherical V socket and having interfitting engagement with said pestle, a compression spring in said tubular V 7 member and -recess, means to vary'thebompression of said spring, and meanstoindicate the amount-of said compression. V a r V 5. A device of 1 the character described comprising a mortar, a memberbearing'a socket sup ported'thereabove, a pestle having a tubular'mem- Vber, another tubular member telescoping with the first tubular member, a'c'ompression spring within and between said tubular members, a swiveledw bearing'for one of said members mounting the:;

V pestle for universal movement in:the mortar, means to vary said spring pressure andholdthe same in adjusted posltio'n, andr means'gto'register said. pressure. a

' 6. A device of the character described com wo prising a mortar and-a pesug eans adapted to V maintain said pestle in operativecontact-withsaid mortar, sai'd means includingfia pivot and an adjustable spring connection-gbe'tween said-pestle 'an'd "said pivot, said :mortar having; a" cover with 5 flared .bore an'd the pestle havingf'a semispheri'calishaped mernber for :bearing Qrelatibh :ship' with the cover beneath the flared bore; said V pestlei'adapted to move ang'ularly therein and 'tD 'V engage the wall of said -bore to limitthere'lative 7 movement of 'the pestle to-theiimorta'r. y 

